So what exactly will Walsh and Slash, respectively, bring to the roast? Will Walsh come in character as a doctor to squash Sheen's "tiger blood" theory? Will Slash bring his guitar to provide some nice mood music, or to rip apart the Two and a Half Men theme song?

The Comedy Central Roast of Charlie Sheen will tape Sept. 10 and air on Monday, Sept. 19 at 10/9c.